======================各位VC同胞，帮忙呀! up有分！＝＝＝＝＝＝＝＝＝＝＝＝＝

[pursuer_zhao]

求时间差
struct tm TmpLogTime;

TmpLogTime.tm_isdst =0;

TmpLogTime.tm_year =01;

TmpLogTime.tm_mon =11;

TmpLogTime.tm_mday =26;

TmpLogTime.tm_hour =21;

TmpLogTime.tm_min =23;

TmpLogTime.tm_sec =15;
//过一段时间后
struct tm Nowtime;
time_t aclock;
time(&aclock);
memcpy(&Nowtime,localtime(&aclock),sizeof(tm));

//求时间差
double d=difftime(mktime(&Nowtime),mktime(&TmpLogTime));

怎么求不出来呀！
在家帮忙呀！

[pursuer_zhao]

补充一点：
TmpLogTime 是一开始的时间
Nowtime是过一段后的时间

[hypmonkey]

差的单位是什么？
秒？

[pursuer_zhao]

是呀！
difftime的返回值就是秒呀！

[alphagx]

你把TmpLogTime.tm_year =1;
改成
TmpLogTime.tm_year =101;

[pursuer_zhao]

不行呀，我本是这样的
TmpLogTime.tm_year =2001;

2001和101有什么区别呢？

[alphagx]

我电脑上运行正确，
你要注意返回值是秒。你返回多少呢？？
下面是各字段的定义
int tm_sec; /* seconds after the minute - [0,59] */
int tm_min; /* minutes after the hour - [0,59] */
int tm_hour; /* hours since midnight - [0,23] */
int tm_mday; /* day of the month - [1,31] */
int tm_mon; /* months since January - [0,11] */
int tm_year; /* years since 1900 */
int tm_wday; /* days since Sunday - [0,6] */
int tm_yday; /* days since January 1 - [0,365] */
int tm_isdst; /* daylight savings time flag */

[pursuer_zhao]

to:alphagx 多谢！
不过我的原程序是这样的，却不行：
char logtime[]="20011126221315";
TmpLogTime.tm_isdst =0;

char tmpT[4];
strncpy(tmpT,logtime,4);
tmpT[4]='\0';
TmpLogTime.tm_year =atoi(tmpT);

strncpy(tmpT,logtime+4,2);
tmpT[2]='\0';
TmpLogTime.tm_mon =atoi(tmpT);

strncpy(tmpT,logtime+6,2);
tmpT[2]='\0';
TmpLogTime.tm_mday =atoi(tmpT);

strncpy(tmpT,logtime+8,2);
tmpT[2]='\0';
TmpLogTime.tm_hour =atoi(tmpT);

strncpy(tmpT,logtime+10,2);
tmpT[2]='\0';
TmpLogTime.tm_min =atoi(tmpT);

strncpy(tmpT,logtime+12,2);
tmpT[2]='\0';
TmpLogTime.tm_sec =atoi(tmpT);
//过一段时间后
struct tm Nowtime;
time_t aclock;
time(&aclock);
memcpy(&Nowtime,localtime(&aclock),sizeof(tm));

返回值总是0

[pursuer_zhao]

搞定！给分！